In this paper, the performance of opportunistic relay selection (ORS) in a cognitive radio is analyzed over flat Rayleigh fading channels. Data transmission between source and destination is assumed to be entirely performed via the relays. Relay nodes are assumed to have ability to harvest energy from the source signal and use that harvested energy to forward the…
Tags: 2016 OMNeT++ Projects
crSimulator: A discrete simulation model for cognitive radio ad hoc networks in OMNeT ++
Cognitive Radio is an exciting new technology for efficient use of radio spectrum. Research oncognitive radio has for a large part, focused on physical layer issues such as robust spectrum sensing and radio environment characterization. The networking of cognitive radio nodes is equally important however as new protocols need to be developed to cope with physical layer dynamics. The lack of a widely used and open source simulation…
Image and video transmission in cognitive radio systems under sensing uncertainty
This paper studies the performance of hierarchical-modulation-based image and video transmission incognitive radio systems with imperfect channel sensing results under constraints on both transmit and interference power. Data intended for transmission is first compressed via source coding techniques and then divided into two priority classes, namely high priority (HP) data and low priority (LP) data, by taking…
Virtualized cognitive network architecture for 5G cellular networks
Cellular networks have preserved an application agnostic and base station (BS) centric architecture1 for decades. Network functionalities (e.g. user association) are decided and performed regardless of the underlying application (e.g. automation, tactile Internet, online gaming, multimedia). Such an ossified architecture imposes several hurdles against achieving the ambitious metrics of next generation cellular systems. This article first highlights the features…
An Alternative to Decoding Interference or Treating Interference as Gaussian Noise
This paper addresses the following question regarding Gaussian networks: Is there an alternative to decoding interference or treating interference as Gaussian noise? To state our result, we study a decentralized network of one primary user (PU) and one secondary user (SU) modeled by a two-user Gaussian interference channel. In one scenario, the primary transmitter is constellation-based and PUs…
Implementing Packet Transfer in Wireless Networks Using PyGame
Cloud environment on wireless networks is a combination of cloud and mobile technologies. The goal is to support mobile applications more efficient way to utilize bandwidth, energy consumption, hardware utilization, and cost. Cloud is a virtualization concept (borrowed from the virtual machine environment introduced in 1970’s) in wireless communications to utilize the resources efficiently and provide the…
Ant Colony Optimization-Based Adaptive Network-on-Chip Routing Framework Using Network Information Region
The network-on-chip (NoC) system can provide more scalable and flexible on-chip interconnection compared with system bus. The performance of on-chip adaptive routing algorithms greatly relies on the adopted network information. To the best our knowledge, previous routing algorithms utilize either spatial or temporal network information to improve performance. However, few works have established a framework on analyzing the network information nor showed…
SAVE: Energy-aware Virtual Data Center embedding and Traffic Engineering using SDN
Cloud computing is a popular computing paradigm which provides the virtual resource as a form of VM to customers in an on demand manner. Existing provisioning solutions were only limited to provision computing resource (e.g., CPU, RAM and etc.), therefore, it was difficult to provide more advanced cloud services. Virtual Data Center (VDC) embedding, which…
Flowshadow: a fast path for uninterrupted packet processing in SDN switches
Updating rules in the flow tables of SDN switches are complex and time-consuming. Therefore, we propose a cache-based scheme (named FlowShadow) to improve the packet processing performance and keep continuous operating while updating rules in the flow tables. FlowShadow caches the microflows in the hash table to build a fast path for packet processing. By…
Minimizing resource protection in IP over WDM networks: Multi-layer shared backup router [invited]
Optical networks and Internet Protocol/Multi-Protocol Label Switching (IP/MPLS) based networks have been traditionally designed and operated by separate departments of network operators. Likewise, both layers have always represented different business areas for system providers, which maintain different product lines for each of them. However, network operators have an IP/ MPLS over WDM architecture. The main drivers for this unique transport network are the cost savings…